Subaru Legacy 2004 Service Manual page 3143

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
AB:DTC C0042 ABS WHEEL SPEED SENSOR POWER MALFUNCTION
NOTE:
For the diagnostic procedure, refer to DTC C0042 "POWER VOLTAGE MALFUNCTION". <Ref. to VDC(di-
ag)-67, DTC C0042 POWER VOLTAGE MALFUNCTION, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
AC:DTC C0044 AT COMMUNICATION
DTC DETECTING CONDITION:
No CAN signal from TCM.
TROUBLE SYMPTOM:
• ABS does not operate.
• VDC does not operate.
Step
1 CHECK LAN SYSTEM.
Perform the diagnosis for LAN system. <Ref. to
LAN(diag)-24, OPERATION, Read Diagnostic
Trouble Code (DTC).>
2 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in TCM
3 CHECK TCM.
4 CHECK VDCCM&H/U.
1) Connect all the connectors.
2) Erase the memory.
3) Perform the inspection mode.
4) Read the DTC.
5 CHECK OTHER DTC DETECTION.
Check
Is there any fault in LAN sys-
tem?
connector?
Is the TCM normal?
Is the same DTC displayed?
Is any other DTC displayed?
VDC(diag)-70
Yes
Perform the diag- Go to step 2.
nosis according to
DTC for LAN sys-
tem.
Repair the con- Go to step 3.
nector.
Go to step 4. Replace the TCM.
<Ref. to 4AT-65,
Transmission Con-
trol Module
(TCM).> <Ref. to
5AT-61, Transmis-
sion Control Mod-
ule (TCM).>
Replace the Go to step 5.
VDCCM&H/U.
Perform the diag- It results from a
nosis according to temporary noise
DTC. interference.
No